问题
解答题
下面各题写出必要的计算过程,能简便计算的要简便计算.
|
答案
|
7 |
18 |
9 |
14 |
1 |
4 |
×21×9 14
=3;2 9
×11 14
×7 10
=8 33
;2 15
×3 4
+2 5
×3 5
,3 4
=(
+2 5
)×3 5
,3 4
=
;3 4
×4 5
+5 8
×5 12
,4 5
=
+1 2
,1 3
=
;5 6
×(9 20
-2 3
),3 7
=
×9 20
-2 3
×9 20
,3 7
=
-3 10
,27 140
=
;3 28
(
+5 6
)×5 8
,8 25
=
×5 6
+8 25
×5 8
,8 25
=
+4 15
,1 5
=
;7 15
×254 15
×39,8 27
=
×4 15
×39,683 27
=
;35516 135
45×
=6 35
;54 7
13×
|
5 |
27 |
3 |
5 |
×4 5
×5 8
=5 12
;5 24
×21×9 14
=3;2 9
×7 9
×27 49
=5 7
;15 49
17×
=99 16
;9 16
(
+3 4
)×32,5 8
=
×32+3 4
×32,5 8
=24+20,
=44;
×5 9
+3 4
×5 9
,1 4
=(
+3 4
)×1 4
,5 9
=
;5 9
×5 4
×16=1 8
;5 2
+1 5
×2 9
,3 10
=
+1 5
,1 15
=
;4 15
44-72×
,5 12
=44-30,
=14.